Improvement in apparatus for coating metal plates



E. MOREWOOD & I. H. ROGERS. APPARATUS FOR COATING METAL PLATES.

Patented Jan.4, 1876.

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Wiiwessea Mm% d am MPETERS. PHOTO LITHUGRAPMEFL WASHINGTON. D. C.

. sheets of metal with tin, terne, or other metal,

one side, and, after having passed between the rollers E E. zis a pan orvessel, made of crukept heated more evenly throughout, and that side thebath to keep up its temperature, and

'UNITED STATES PATENT OFFICE. I

EDMUND MOREWOOD, or LLANEDLY, AND JOHN HENRY ROGERS, OF LLA'NGENNEGHARK, NEAR LLA ELLY, GREAT BRITAIN.

IMPROVEMENT IN APPARATUS FOR COATING METAL PLATES.

Specificationforming part of Letters Patent No. 171.686, dated January4, 1876; application filed January 15, 1875.

To all whom it may concern:

Be it known that we, EDMUND MOREWOOD, of Llanelly, and JOHN HENRYROGERS, of Llangennech Park, near Llanelly, Oarmarthenshire, GreatBritain, have invented certain Improvements in Coating Metals with Tin,Terne, or other Metals or Alloys,.and in apparatus therefor,of which thefollowing is a specification:

Ourinvention relates to an improvementin the bath containingthe meltedmetal, whereby a portion of its surface is excluded from the atmosphereby a pan containing sand or other slow conductor of heat, and the undersurface of this pan is provided with a sheet-metal scraper for removingdross or scurf. We also employ an improved flux-pot, for renderingtheaction of the flux more uniform upon plates that are cold or wet;'said improvement relating to receptacles for sand, applied between the flux-pot and thebath of melted metal at each side of the space throughwhich the plate passes.

In the drawing, Figures 1 and 2 are vertical sections of the pots orbaths for coating said views being transversely of the coatingrollersand Fig. 3 is a plan, and Figs. 4 and 5 are vertical sections, of theflux-pot. v

The bath 0 contains coating-metal, and also a series of pairs ofrollers, D D, and guides g. The plates to be coated are made to enter atpairs of rollers D D and guides g, are delivered at the other oropposite side, where the plate, on leaving the last pair of the saidcoating-rollers D D, is caught by the finishingciblcearthenware or othersuitable material, and placed in the bath, as shown, so that. it restsupon, and sinks more or less into, the melted coating-metal. This pan 2is filled with sand or other slow conductor of heat; and the effect ofthis arrangement is, that the metal is the heat of the metal bath isbetter retained. Hence, a less degree of heat is required outthe bath isrendered more durable. The pan is out of the way of the rollers and theguidingframes 9; and this pan 2 may readily be applied to otherdescriptions of vessels used for containing coating-metals. F is a sheetor plate, which is moved occasionally during the working of theapparatus, in order to prevent scurf or other foreign matters fromaccumulating upon the pan-bottom. It may be drawn right through,entering at one side, and coming out at the other. It has loops fortaking hold of it, or hands made of sheet metal, fixed at one end fordrawing it through. This plate will collect on its surface orsurfacesthe scurf or other foreign matter, which can readily be removed from thepot. The rollers D D D ,D, Fig. 2, are so arrangedv as to efl'ect whatmay be termed an alternately over and under action as to form a supplyor channel of melted coating-metal above the nip of these rollers, and

the sheets pass out through this exit-channel,

thereby givinga further coating to those parts which may have beenimperfectly coated in the previous part of the process, or which wouldhave had their surfaces too heavily covered or coated by passing throughthe nip of said rollers if entirely above the coating-metal, and withoutany channel of coating-metal between them. The scurf (especially in thecase of tin) which is contained in the bath, and, by

the rollers, is carried upto the surface, and

which, by the re-entering of the rollers E E on the sides away from thenip, is left on back or exteriorside, can be easily withdrawn therefromby means of a flattened rod of iron or other suitable means. I g

It is not advisable to keep a flux on the sur face of the exit-channelbetween these rollers. unless means are provided for readily removing itfrom the surface of the coated metal;

Hence, the coating-metal. rises above the nip of these rollers E E sofar 1 around the edges, and so keeps it tight.

. grease on the outer sides of the rollers keeps a but when such meansare provided, a flux in the said place enables the plates to be drawnout more rapidly, and bring out a thinner coatin g of metal on theirsurface, than if the sheets came out through clear coating-metal.

On the back or exterior sides of the rollers a suitable flux-such astallow or grease-for tinpor terne metal is employed. The flux on theexterior sides of the rollers is keptfrom flowing toanyextent to thechannel by means of the guard-plates G G, which fit loosely in andaround-the grooves cut in the rollers E E.

The flux, on commencing work, soon thickens therollers hot, clean, andin proper order.

When the entering plates or sheets are wet,

. or: comparatively cold, they also tend to chill the flux orcoating-metal as they enter.

In order to obviate the aforesaid inconveniencesweemploy an improvedflux-box, in

which the lower part of the sides is made don ble, say, to aboutfive orsix inches above the level of the coating-metal and between the pieceswhich form thesides of the box we place sand or other slow conductor ofheat. Such flux-box may also be applied on the entrance side of theafter bath.

Fig. 3 isa plan of our improved flux-box with'the circulatingarrangements applied thereto. Fig. 4 is a vertical longitudinal sect1on,and F1g. 5 is a vertical cross-section.

A is the flux or grease box, comparatively of the flux-box.

2 a. ose

wide on the top, butnarrowing down to the bottom, which descendsthreewjor four inches: below the surfaceof theplnelted 3 coating metaliI I are the chambers between the double sides In the chambers we placesand or other non-conductor of heat. C G is the coating-metal bath, intowhich theuplates or pieces of iron to be coated 'pass from the flux-boxA. The circulating arrangement, in this case, consists of anoverflow-gutter, d,

whichpasses along in a slanting direction,

as shown, and which allows the frothyoverflowing part of the flux toright itself during 1 its passage through said gutter, and to returnEDMUND, MOREWOODJ JOHN HENRY ROGERS. a

Witnesses:

B. J ONES,

Solicitor, Llwnelly, South Wales.

HENRY THOMAS, his Clerk.

